It's good to try different things. Try a month without caffeine, alcohol or other stimulants for a month to find a baseline. Then you can find what's good for you.

I have a friend psychiatrist who told that she had given the standard first question and advice for over decade for sleep problems: "How much you drink caffeinated beverages? Maybe you should drink less" before she took the advice herself.

She was amazed how well she slept without caffeine even when she didn't think she had sleeping problems or difficulties. She just didn't remember what it was to sleep really well anymore.